ER24 paramedics, along with other services, arrived on scene and found the light motor vehicle lying in the veld.
On assessment, paramedics discovered that the deceased woman (30s) had already sustained fatal injuries after she was ejected from the vehicle.
A two-month-old baby girl lay near the vehicle in a critical condition. Paramedics had to provide the patient with advanced life support to stabilise her.
Two other children, aged 10 and 14, sustained moderate injuries. The father sustained only minor injuries.
Paramedics treated the patients for their injuries and transported them to a nearby hospital for further treatment.
While on route, paramedics had to begin CPR on the three-month-old patient to maintain her signs of life.
Local authorities were on scene for investigations.